Before hiring from abroad the employer has to get a Labor Certification application approved by the Department of Labor. PERM, Program Electronic Review Management, is a Labor Certification application process that came into effect on March 28, 2005.
card - thin cardboard, usually rectangular. corrugated board, corrugated cardboard - cardboard with corrugations (can be glued to flat cardboard on one or both sides) paperboard, poster board, posterboard - a cardboard suitable for making posters. pasteboard - stiff cardboard made by pasting together layers of paper. strawboard - a coarse yellow cardboard made of straw pulp. paper - a material made of cellulose pulp derived mainly from wood or rags or certain grasses.
I get asked that a lot. There are many differences as well as similarities between the two. Often looking very similar, both folding cartons and rigid boxes are indeed boxes used for packaging and both are made of paperboard. Paperboard is basically thick paper that is sturdy enough to be used for packaging.